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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121911#comment-13121911
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Simon Willnauer commented on LUCENE-3433:
-----------------------------------------

bq. +1 - something contentious should not be removed in an unrelated issue like 
this. If it's already in, but some want it out, let's make an a new issue to 
discuss. Once something is in, there should be a clear and dedicated issue 
discussing it's removal if there is dispute. I don't agree with simply pulling 
it and putting the onus on those who want it to make an issue to get it back in.

there is no dispute here If you'd have looked at the API and the code you'd 
know what I talk about though. We cut over to a new api where sorted source 
doesn't fit in nicely. We had ValuesEnum used for merging as the LCD between 
SortedSource and Source. Now we only have Source as a RandomAccess API. To keep 
this at a reasonable size we should try to add the missing part in a different 
issue. We should also rethink how to merge sortd sources since they are quite 
mem heavy (I think this is a potential issue). Adding back SortedSource is 
going to be tough without a new issue since lots of stuff has changed. To make 
this dev process easier backing out and re-adding seems best to me. Don't worry 
we gonna add it back though.
                
> Random access non RAM resident IndexDocValues (CSF)
> ---------------------------------------------------
>
>                 Key: LUCENE-3433
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3433
>             Project: Lucene - Java
>          Issue Type: New Feature
>    Affects Versions: 4.0
>            Reporter: Yonik Seeley
>            Assignee: Simon Willnauer
>             Fix For: 4.0
>
>         Attachments: LUCENE-3433.patch, LUCENE-3433.patch, LUCENE-3433.patch, 
> sorted_source.patch
>
>
> There should be a way to get specific IndexDocValues by going through the 
> Directory rather than loading all of the values into memory.

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